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Technology platform-based income - Summary of Retail Credit Facilitation Service Fees (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of retail credit facilitation service fees [line items]      
Retail credit facilitation service fees ¥ 28,621,121 ¥ 36,793,020 ¥ 39,587,797
Goods or services transferred at point in time [member]      
Disclosure of retail credit facilitation service fees [line items]      
Referral income from platform service 1,146,925 706,046 130,893
Loan facilitation service [member] | Goods or services transferred at point in time [member]      
Disclosure of retail credit facilitation service fees [line items]      
Retail credit facilitation service fees 3,446,163 5,675,612 7,141,725
Post origination service [member] | Goods or services transferred over time [member]      
Disclosure of retail credit facilitation service fees [line items]      
Retail credit facilitation service fees ¥ 24,028,033 ¥ 30,411,362 ¥ 32,315,179